Updates prices at 1715 GMT
By Eric Onstad
LONDON, Feb 21 (Reuters) - Copper prices retreated on Friday on concern about demand in China after inventories rose and on uncertainty over possible U.S. tariffs.
Three-month copper on the London Metal Exchange (LME) was down slightly at $9,561.50 a metric ton by 1715 GMT, having touched its highest level in three months a week ago.
Copper inventories in warehouses monitored by the Shanghai Futures Exchange (SHFE) over the past week, data showed on Friday, having soared by 162% since late January.
Stocks rise in China on a seasonal basis around the lunar new year holidays, but the data added to disquiet about Chinese demand after data earlier in the week showed new home prices .
The Chinese property sector is a key demand driver for industrial metals.
SHFE copper fell 0.5% to 77,000 yuan a ton.
"In China, the house prices were still pretty rubbish and the demand upswing on copper after the new year holidays has been mild. People are saying that it's being held back a bit by higher prices," said Dan Smith, head of research at Amalgamated Metal Trading.
LME copper prices have gained 9% so far this year.
"The end of war in Ukraine would be quite bullish overall, but then offsetting that is all the Trump turmoil around tariffs. So you've got those two dynamics which are very difficult to quantify," Smith added.
U.S. President Donald Trump said he would unveil over the next month or sooner, adding lumber and forest products to previous for duties on imported cars, semiconductors and pharmaceuticals.
LME inventory data showed 42,575 tons of fresh cancellations of copper as holders of metal gave notice they planned to remove the material. That cut the amount of available copper in LME warehouses by 17% to 215,900 tons.
A stronger dollar also weighed on metals, making commodities priced in the U.S. currency more expensive for buyers using other currencies.
Among other metals, LME aluminium fell 1.5% to $2,686.50 a ton and nickel lost 1.1% to $15,495 while zinc rose 0.4% to $2,930, lead added 0.7% to $2,006.50 and tin climbed 1.1% to $33,755.
($1 = 7.2489 Chinese yuan renminbi)
(Reporting by Eric Onstad; Editing by Maju Samuel, Kirsten Donovan)
((eric.onstad@thomsonreuters.com [eric.onstad@thomsonreuters.com]; +44 20 7542 7093; Twitter https://twitter.com/reutersEricO; [https://twitter.com/reutersEricO;] Reuters Messaging: eric.onstad.thomsonreuters.com@reuters.net [rm://eric.onstad.thomsonreuters.com@reuters.net/]))
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